Date: Fri, 21 Mar 2008 11:42:30 -0700 From: Julian Elischer <julian@elischer.org> To: Barney Cordoba <barney_cordoba@yahoo.com> Cc: current@freebsd.org Subject: Re: kvm_read() vs ioctl performance Message-ID: <47E40196.6060703@elischer.org> In-Reply-To: <454731.813.qm@web63913.mail.re1.yahoo.com> References: <454731.813.qm@web63913.mail.re1.yahoo.com>
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Barney Cordoba wrote: > I have an app which reads stats from the kernel > periodically, and there can be a lot of iterations, > sometimes 20,000 or more. I'm thinking of converting > from an ioctl method to kvm_read(). KVM is certainly > simpler, but its not clear what overhead is involved, > since kvm_read() likely has to call the kernel also. > > Does anyone have a handle on the difference in > overhead, assuming that the ioctl call is to a module > which does nothing more than copy the data and return? tried a shared memory page? > > Thanks, > > barney > > > ____________________________________________________________________________________ > Be a better friend, newshound, and > know-it-all with Yahoo! Mobile. Try it now. http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ > _______________________________________________ > freebsd-current@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-current > To unsubscribe, send any mail to "freebsd-current-unsubscribe@freebsd.org"
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